Internal combustion engine



Jan. 12, 1937. W..H.ROBERTSON 2 V INTERNAL COMBUSTION ENGINE Original Filed June 14, 1928 [NI FA M P055? a I M w m .Reiuued Jan. 12,1937 i I Y UNITED STATES PATENT oFFicE.

' ETERNAL COMBUSTION ENGINE William H. Robertson, Dayton, Ohio Original No. 1,879,910, dated September 2'1. 1932.

Serial No. 285,414, June 14, 1928. Reissue application September 25, 1934, Serial No. 745,480. Divided and this application for reissue, March 26, 1935, Serial No. 13,182

7 Claims. (Cl. 123-139) This invention relates to fluid pumps and more Frame I3I is provided with fuel inlet passage particularly to fluid pumps of the valveless type, I32 connected with inlet pipe I33 which leads this invention being a division or my copendlng f a fuel k. n t h wn- Pass 32 leads reissue application, Serial No. 745,480, filed Sepinto inlet port I34 provided in sleeve I30. Frame tember 25, 1934. I3I is provided with fuel outlet passage I35 con- I An object of the invention is to provide a novel nected with fuel outlet pip 35 w ch eads to means for pumping liquids and which is particuthe fuel nozzle described in my above-referred-to larly useful in connection with internal combusp n in reissue pp n. Pa 35 lead tion engines. out from outlet port I31 provided in sleeve I30.

Another, object of the invention is to provide Levers I24 and I25 are provided with slots I44 10 a liquid pump means in which novel means are and I45, respectively, through which pass studs provided to deliver variable quantities of liquid and respectively, Carried y rum from minimum to maximum capacity of the plate I48. Plate I43 is provided with a. slot I49 pump. I through which projects a stud I50 mounted upon Another object of the invention is to provide a a w ll f crank ase 3|- A spacin w sher I El pump means having opposed pistons and indeis located between crank case 3| and plate I48 to pendently operating means for timing the stroke maintain plate I48 in p p alignment.

of the istons relative to one another. As lever I15 must cooperate with ts 10- Ot er and further objects andadvantages of cated on opposite sides of cam 43, said lever I25 the present invention will be apparent from the is Composed of Section 0 c yi t e am 20 following description or a preferred embodiment roller section 50 attached to pl n r 29,

thereof, reference bein made t th accompanyand an intermediate connecting section I25b.

ing drawing. Plate I48 carries a block I52 to which is at- In the drawing: 7 tached by means of stud I53 2. bell-crank lever 25 Fig. 1 is a left end elevation of the fuel pump I54 which is otatab y support d upon the base 25 and operating mechanism;

Fig. 2 is a sectional view taken on the line The cy le of operation f h p p is h wn 'I--I of Fig. 1; in Figs. 2, 4, 5, and 6. In Fig. 2, the plungers I28 Fig. 3 is a right end ele atio 1' th fu l pump and I29 are located in touching relation opposite 30 shown in Fig. 2; v the fuel inlet port I34. Turning cam 43 in the 30 Fig. 4, Fig. 5 and Fig. 6 are sectional views of direction of the arrow I55 causes the plungers certain parts shown in Fig. 2. showing stages of first to be separate as Shown in Fi Caus I Operation of the pump when set to deliver a relafuel to be sucked into sleeve I30. Further tumtively large amount of fuel per engine cycle; and ing of cam 43 au es p and I29 I70 Fig. 7. Fig. 8, Fig. 9 and Fig. 10 are sectional move equal distances to the respective positions 35 views similar to those shown in Fig. 2, Fig. 4, Fig. shown in Fig. 5 which are opposite outlet port 5, and Fig. 6 showing stages of pump operation I31. Further turning of cam 43 causes plungers when the pump is set to deliver a relatively small I20 to I29 to come together as Shown in Fi quantity of fuel per engine cycle. thereby causing the fuel to be forced out through As illustrated herein the invention is applied pipe .When a revolution of cam 43 hes been 40 to an engine. a detailed description of which is completed the pump plungers will be returned to given in my above-referred-to copending reissue the respective positions shown in Fig. 2. The application. Referring to Figs. 1 to 3, it will be pump cam 43 is timed so that fuel will begin to seen that a base 30 supports the crank case 3| be ejected through pipe I30 at the end of the 5 of the engine. A crank shaft 38 extends through compression stroke, and is also timed to regulate 45 said crank case and constitutes a direct drive the flow of fuel by movement of fuel pistons I28 for a fuel p p ce This pump cam 43 is and I29 in accordance with the flow of air passprovided with races I20 and I2I, cooperating with ing through discs (not shown) as the engine pisrollers I22 and I23, respectively, carried by levers tons not shown) separate. 0 I24 and I25 respectively. Levers I24 and I25 are The speed of the engine is controlled by movconnected by studs I25 and I21, respectively, with log lever I54 so as to raise or lower the fulcrum piungers I28 and I29. respectively, which slide studs I46 and I41. If studs I46 and I41 be movedwithin sleeve I30 mounted in pump frame "I to the uppermost position much less fuel will be formed preferably integrally with a side wall of pumped from the fuel tank and ejected into pipe crank case 3|, I36. With the fulcrum studs in such a position, 55

While the form of mechanism herein shown and described constitutes a preferred form of embodiment of the invention, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

I claim:

l. A liquid pump comprising, a cylinder having inlet and outlet ports, a pair of pistons reciprocating in said cylinder, piston driving means including two cams, one for driving each piston independently and in timed relation to the other piston and means for varying, at will, the quantity of liquid pumped while maintaining the time I relation of the different movements of said pistons in the cyclic operation thereof substantially constant.

2. A liquid pump comprising, inlet and outlet ports a predetermined distance apart, a pair of pistons reciprocating in said cylinder, piston driving means including two cams for driving the than the distance between said ports; then to move the pistons in substantially constant spaced relation to bring their inner ends adjacent to the outlet port, then to bring the pistons relatively closer together, then to move the pistons in substantially constant spaced relation back to have their inner ends adjacent to the inlet port.

3. A liquid pump comprising, a cylinder having inlet and outlet ports spaced a predetermined distance apart, a pair of pistons reciprocating in said cylinder, driving means including an operating shaft and mechanism positively connecting a distance less'than the distance between said ports, then moving the pistons in substantially constant spaced relation -to positions adjacent o the outlet port whereby to close off the inlet port and to open the outlet port, then moving the pistons together adjacent the outlet port, and then moving said pistons in substantially constant relation until the inner ends thereof are again adjacent the inlet port.

4. A liquid pump comprising, a cylinder having inlet and outlet ports, a pair of pistons reciprocating in said cylinder, driving means including an operating shaft and mechanism positively connecting each piston, with said shaft for separating the inner ends of the pistons adjacent the inlet port, then moving the pistons in substantially spaced relation to positions adjacent the outlet port whereby to close off the inletport and to'open. the outlet port, then moving the pistons together adjacent the outlet port, then moving said pistons in substantially constant relation until the inner ends thereof are again adjacent the inlet port, and means for adjusting, at will, the mechanism to vary the separation of the pistons while maintaining a time relation of the different movements of said pistons in the cyclic operation thereof substantially constant.

5. A liquid pump comprising, a cylinder having spaced-apart inlet and outlet ports, a pair of pistons reciprocating in said cylinder, driving means including an operating shaft and mechanism positively connecting each piston with the said shaft for moving the pistons apart a distance less than the distance between said ports to uncover the inlet port and to suck in liquid, for thereafter moving the pistons to transfer said liquid from the inlet port to the outlet port thereby closing off the inlet port and opening the exhaust port, and then moving the pistons to gether to squeeze the liquid out through the exhaust port.

6. A liquid pump comprising, a cylinder having inlet and outlet ports, a pair of pistons reciprocating in said cylinder, driving means including an operating shaft'and mechanism positively connecting each piston with said shaft for moving the pistons apart to uncover the inlet port and to suck in liquid, for thereafter moving the pis- -tons to transfer said liquid from the inlet port to the outlet port thereby closing off the inlet port and opening the exhaust port, then moving the pistons together to squeeze the liquid out through theexhaust port, and means for adjust ing, at will, said mechanism toiadjust the last mentioned movement of said pistons to vary the quantity of liquid'ejected through the exhaust port while maintaining the time relation of the different movements; of said pistons in the cyclic operation thereof substantially constant. 1 7. A liquid pump jcomprising, a cylinder having inlet and outlet ports spaced a predetermined distance apart, a pair of pistons reciprocating.

in said cylinder, driving means including an operating shaft and mechanism positively connecting each piston with said shaft for separating the inner ends of the pistons adjacent the inlet port a distance less than the distance between said ports, then moving the pistons in substantially constant spaced relation to positions adjacent the outlet port whereby to close 011 the inlet port and to open the outlet port, then moving the pistons together adjacent the outlet ports,

then moving said pistons in substantially constant relation until the inner ends thereof are again adjacent the inlet port, and means for adjusting, at will, the mechanism to vary the separation of the pistons while maintaining the time relation of the different movements of said pistons in the cyclic operation thereof substantially constant. v

r WILLIAM H. ROBERTSON. 

